Method of tube welding



April 22 1924.

- R. O. BERG METHOD OF TUBE WELDING Filed M rch Fatented Apr. 22, 1924.

.VUNWITED m ss PATENT OFFICE.

Brennan 0. arms, or naraor r, mcmem,

MICHIGAN, a CORPORATION or women.

raonucrs comm, oram'morr,

assienoa r moment swam. runs METHOD 0] TUBE WELDING.-

Application filed Iarch 31, um. Serial ll'o. man.

To all whom it may concern:

Be it known that RICHARD O. Brine a citizen of'the United States, residin at etroit, in the county of Wayne and tate of 6 Michigan, has invented certain new and use"- ful Improvements in Methods of Tube Welding, of which fication.

This invention relates to tube weldin and ding 10 has for its object a new method of we tube.

A common way of welding tube is to use a'line of oxy-acetylene jets which are arranged to strike the seam at the center.

16 This form of welding oftentimes results in blowing through the tube and also causes a bad burr on the inside. Still another form of welding, which has been found to give satisfactory results is to use two lines of 20 jets, which span the seam, the jets strike the time is economical in the use of s, resulte two line so ing in considerable saving over t jet form of welding.

In the drawings:

Fig. 1 is a plan view of the tip by which the method is carried out.

as Fig. 2 is an end elevation of the tip.

Fig. 3 is a cross section on the line 3-3.

Fig. 4 is a plan view of the tube underoing welding.

Referring to'Fig. 1, a designates the open- 40 ing through which the tip stud is passed and secured in place. This tip stud is provided with suitable mixing passageways to .commingleoxygen and acetylene s in a familiar way. The stud is not own as it is 46 well known construction in the art.

l A comparison of Figs. 2 and 4 will show 1 the method of welding which is the subject of the present application. The tip itsel which is only one s 'fic way in which the 50 method may be carri out, is madethe sub 'ect of a co-pendin application. The holes in this tip are dril bei disposed at an angle to the perpendic ar. through the the following is a speci-.

this method will be seen.

f edge ed on oblique'linea' one tip tube at the center of the seam and the next one at an angle to such perpendicular on the opposite side of the perpendicular. In other words the jet openings or passageways are directed alternately and obliquely, first to one side and then to the other. These passageways might be each contained in a separate tip with a separate mixing chamber, hence the method is entirely separate from the tip, which is claimed in the copending application.

By referring to Fig. 4, the advantage of The preheating jets, which may be said to be the first four jets at the top of the tube as shown in Fig. 4 strike the faces of the edges of the tube: The faces of the edges of the tube will not be on strictl radial lines, but will tip at somewhat 0 an angle thereto, hence the faces of the edges Wlll appear somewhat as shown in Fig. 4, to one viewing the same from the top of the tube. The jets being tipped, as shown in Fig. 2, will play upon such faces at an angle 1t is true, but at an angle which will approach an angle of 45 degrees to the perpendicular. This will result in heating the edges better, due to a more direct strike than is ordinary the case and will also heat the tube effectively clear throu h. In this preliminary heating no objection results from so directing the 'ets that they go through the tube, as the me a1 does not'here become molten.

The weldin rolls are so adjusted that they are calcu ated to brin the edges of the tube together as shown in ig. 4 at the point where the metal -actually becomes molten. Molten metal is shown in the black patch in Fig. 4. The result, is that where the jets strike the faces of the edges of the tube, the force of the jet blowing through does no harm because the metal is simply beingheated u to a red heat, but has not yet become molten. At the oint where the metal begins to run the wel ing and feeding rolls are so adjusted as to cause the edges to contact, consequently the obliquely directed jets strike the metal to the inside of the meeting s so that they do not tend to blow through the very center of the same, which is the weakest point. Striking the metal at the sides of the edges the sort of puddle or flow the metal in towar s the center causing a slight rid at the center. The last jet strikes thetu directly in the center of 10 weld is effected, because the the seam, leveling this ridge and thereby avoiding an objectionable burr on the outside of the tube.

We find that this method of Welding is very effective especially with large sized tubing, where the tube is fairly thick and the exposed faces of the opposing edges are some Width; economical operation results in the wayof saving gas, and a very good preliminary heats the edges of the tube clear heatin h due to striking the edges at an anthroug approaches a direct or ndicular strike. at we claim is: The method of weldin which com rises the causing of the tube b ank to trave longitudinally and directing the flame jets to alternately strike the lip-turned faces of the exposed edges of the tube on opposite sides of the same, the said method being practised with a relatively long line of jets.

In testimony whereof I aflix m signature. RICHARD BERG.

gle that somewhat per 

